Dead-bolt night latch



Feb. zo, 1923'. 1,446,085

M. FALKl DEAD BOLT NIGHT LATCHAL' Filed Dec. 5, 1921 pmylsegvlgggei nel)l ill/IIIA Patented eb. 2G, 1921ik lowing is a specification.

MORRIS FLK, OFVLEOMINSTER, MASSACHUSETTS.

` lDEAD-BOLT NIGHT LATCH.'

Application ledfDecemrberrS, 1921. Serial'No. 519,742.

To all 1.0/1 om t ma-g/ concern.:

Beit known that I. MORRIS Faut; a citizen of the United Statesl`residing at Leclininster,v in the count;v of lVorcester and State ofMassachusetts. have invented a new and useful Dead-Bolt Night Latclff ofwhich the fol- Ths invention relates to a lock of the night latch type.Yi

' The principal objects ot' the invention are j to'provide means wherebythe latch can be positiveljv locked against being turned by the usualknob or b v the exertionlof force on the inclined side of the'latch. andthis action can be provided for merelj7 by turning the ke v itself' fromthe outside: to provide means whereb)v 'the lock casing can be locked toone of the attaching screws` b vmeans of the lock; to preventdetachmentot' .the casing, and to provide this in a simplel form thatcan 4'be applied to ordinary night latches without redesigning them.

Reference is to be hadto the accompanying drawing, in 'which Fig. 1 is aplan of a night latch constructed viniaccordance with this inventionwith partof the'cylinder only in section;

Fi-g. 2 is a sectlonal view of the same on the line 2 2 of Fig. 1;

Fig. 3 is a sectional view similar to a portion of Fig'. 1. but showingthe parts in a different position;

Fig. 4 is a sectional-view 0f, Fig-1;

Fig. 5 is a plan of the back plateof the on the' ,une 4 4 casing. and

' Fig. 6 is a. sectional view through the' center of the knob and lockshowing a* modification. v Y i The `invention is shown as applied to anight latch of the type in'volving'a casing 10 I -and a housing 11 forthe spring bolt 12.-

' This bolt 12 is mounted on two rods 13 which V`enabler lock 19 intowhich the key is adapted to be placed from the outsideformanipulatingthe'lock. rIhis slot is widened at both endsto permit thebar 18 to. turn slightly at the end of its oscillation without turningthemember 17. On the inside of the door is a knob 20 which has rigidlyfixed von it an inner plate 25 provided with an eccentric projection 21and rotates lon the axis of the lock 19.. This projection 21 is adaptedto engage the stationary cross vpiece* at one end f the path' ofoscillation of the knob toplimit its motion in one direction. rlhe plateon which the projection 21 is located j also has anotherprojectionfprovided with a slot 26 adapted to receive the` plate orplates 16 and positively move the latch4 against the action of the'springs into the position shown in Fig. 3 and also inthe otherIdirection. 'n v f Rotatable with the bar 18 but supported by the knob isa member 22 on the inside of thev casing y10 having a wide slot for thebar 18 and extending through the plate 25.l On

the inner side of the plate 25 this rotatable member 22 is provided witha disc 23 hav' ingan arm 24 projecting therefrom radially. Tl1is.`beingfixed with respect to the bar 18, will turn with it and with the key..When the operator is about to withdraw the key from the lock he can turnit as far around as possible in the rearward direction to the positionshown in Fig. 1. There thel arm 24 cornes against a lprojection 27extendlng from the flat side of the plate 25. Now, the key beingwithdrawn leaving the lock derstood in this art. lTherefore theprojecting arm 24 and plate 25 cannot turn and any tampering with thebolt 12 will fail to move it baokwardly in opposition to these parts.But when the key is introduced and turned all the way round in thevopposite d1- rection to retract the bolt 12 the bar 18 is be withdrawn.The plate I25 is left free to turn and the bolt 12 can be drawn backfrom without or by the knob land the arm 24 1s left-in' the positionshown vin Fig. 3 as there will then be no resistance to thisaction. -Towithdraw th key'it is turned back to horizontal positlon without tu'rninvthe members 17 and 23 and the bolt 12 1s left free to be movedout byits springs.

` The two members 17 and 22 are shown as separate', each having an,enlarged or wide flocked, the bar 18 cannot turn 'as is well unleft inhorizontal positionand the key/can y central slot for the bar 18` toprovide a little lost motion and as separated by a spring 28. They can,however, be made in one piece'if desired, as shown in Fig. 6.

In this way avery simple' means 1s pro-l nipulated by the key, it isindependent of This prevents the unscrewing or withdrawal `any actionfrom the other side. J1t will be seen that when the key is inl theJlock, Jthe bolt 12 can be moved freely by the knob 20, but when the arm24 is turned back into the position sho'wn lin Fig. 1 andthe keywithdrawn the operation of the knob 20 cannot be effective to withdrawthe bolt.

ln order to prevent an intruder reaching in and removing the screws thathold the latch casing, after breaking the glass', I provide anadditional locking means. 0n the member 17 is a radial projection 30 inposition to engage a projectioni on a swinging latch 32. This latch ispivoted to the back 38 of the casing and has a limit stop pin 34. Theedge of the latch is swung.

around, whenever the lock is locked, into a posltion 'to engage 1n acircumferential slot 35 in a screw 36 which holds 4the end of the lockcasing most` remote from the latch 12.

of the screw.

In the form shown in Fig. 6 the two members 17 and22 vare formed in cnepiece constituting a cylinder 40. Otherwise the action and constructionare the same. 1

Although lI have illustrated and described only two forms of theinvention.y I am aware of the fact that other modifications can be jmade therein by 'any person skilled in the art without Adeparting fromthe scope of the.

invention as expressed in the claims. Therefore, Fdo not wish to belimited to all the.

details of construction herein shown and described, or especially to thedetails of the well known night -latchillustrated herein. except asexpressed in thel claims.

What I do 'claim is 4 f 1. In a latch having a 'spring pressed bolt,the`combination -with hand operated means for 'retracting the Abolt inopposition to the springs, and a lock comprising a -cylinder forreceiving a key and a bar thereon'adapt'- ed 'to be .governed by the keyand locked by it on the withdrawal of thekey, said hand o-perated meanshaving means oscillatably -mounted thereon for preven-tingthe retrac-`tion of said boltwhen the key is turned all the way around ba-ckwardlyand withdrawn. i

2. In a night latch,'thecombination with a spring pressed Abolt and acylinder pin tumbler lock havingza bar, oi a member concentric withthecylinder adapted'to be oscillated by the har, said member having aprojection, and a plate oscillatable about the center of said 4memberand having means for engaging said projection to prevent lthe turning ofsaid plate when the projection is held in its way, said plate havingmeans for positively moving. the bolt in both directions. l

3. In a night latch, the combination with a spring pressed bolt and acylinder pin tumbler lock having a bar, of a member concentric with thecylinder adapted to be oscillated by the bar, sai'd member having aprojection, a plate oscillatable about the center of said member andhaving means for engaging said projection to prevent the turning of saidplatel when the projection is held in its way. said plate having mea-nsfor `positively moving the bolt in both directions, and a'knobconcentric with lsaid cyl-f inder to which knob the plate is lixedlyconnected.

' 4C. ln a night latch, the combination with a "spring pressed bolt anda cylinder pintum- -engaging said projection' to prevent the turning ofsaid plate when the projection is held in its way, said plate havingmeans for v positively moving thepbolt `in bothr directions, comprisinga slot for connection with the bolt, said plate having a projection forengaging the side of the casing to limit the amplitude ofthe oscillationof the plate.

5. In a latch having a spring pressed bolt, the combination with handoperated means for retracting the bolt in opposition to the springs, anda lock comprising a cylinder for receiving a key and a bar thereonadapted to be governed by the key and locked by it on the withdrawal ofthe key, saidy knob having means oscillatably mounted thereon forpreventing the retraction of said bolt when the key is turned all theway around backwardly'and withdrawn, a screw for fastening the rear endvof the casing of the latch, saidscrew having a lateral slot,

and means operated by said cylinder lock for engaging in said slot andpreventing the withdrawal of the screw.

6. ln a dead bolt night latch, the combination with'the latch vcasingand a lock therefor, of a screw for securing the casing to av door, saidscrew having a notch through one side, ,an oscillatable plate inposition to swing into said notch to lock the screw, and means operatedby the lock Jfor turning said plate to locking position when the lock islocked.l Y

7.- llin a night latch, the combination with acasing, ofl a key cylinderlock outsidel the means connected casing having a barff projectingtherefrom into the casing, a disc mounted to rotate With the bar andhaving a slot for-the bar, said slot being widened at both ends topermit a small amount of lost motion, and having an arm, a plateoscillatablymounted and having a projection in position to be engaged bysaid arm, a spring-pressed bolt, Aand With said bolt for engagement withthe said plate to prevent the bolt being Withdrawn when the arm is inposition for lengaging said projection and the key is reversed andWithdrawn.

8. In a night latch, the combination With a spring pressed bolt and thebar of a lock, of a member adapted to be oscillated byithe bar, saidmember having a projection, and a plate oscillatable about the center ofsaid member and having means for engaging said projec-` tion to preventthe turning of said plate When the projection is held in its Way, saidplate having means for positively moving the bolt in both directions,comprising a slot for connection With the bolt, said plate having aprojectionfor casing to limit the amplitude ofthe oscillation of theplate. v

engaging the side of the 9. In a night latch, the combination with abolt, of a'member adapted to be oscillated by the bar of a lock, saidmember having a projection, a plate oscillatable about lthe 4center ofsaid member and having means fo engaging said projection to prevent theturning of said plate When the projection is held in its Way, said platehaving means for positively moving the` bolt in both `,directions, anda. knob to which the plate is fixedly connected. j

l0. Ina night latch the combination with a bolt and springs for movingit out, of a hand-operated knob, a and oscillatable thereby and having aprojectionfof a locking bar adapted to be o erated by a key and lockedby it on the Witiidravvaljoi" the key, a member adapted to be oscillatedby said locking bar and having means for operating the said projectionto prevent the turning of said plate when the key is Withdrawn after thebolt is` priojected, said plate having means for tively movingthe boltin both directions.

In testimony whereof- I have hereunto affixed m 4 si ature.

\ y gn 4. MORRIS FALK.

plate centered thereon posi-

